I'm about to order a screen and was debating size. So went to ProjectorCentral calulator and numbers were ft lambert 21 and 18 for screen diag 110/120 respectively. I called up JVC to confirm and support said with this projector there is no light loss with any screen size up to 200 inches. Since this is my first projector i am confused by this because even the salesperson never mentioned this when i discussed screen size and was trying to use his calculator to figure this out.